Sewing machine



M. BUONO SEWING MACHINE July 11, 1950 3 Shee.cs-Sheet 1 Filed June 21, 1949 I I, I

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INVENTOR MARIO BUONO ATTORNEYS \N TNF'WI I V mm r' t In M. BUONO SEWING MACHINE Jul 11, 1950 3 Sheets-Sheet 2 Filed June 21, 1949 INVENTOR MARK) BLJONO M s ljflm,

FIG. 4.

ATTORN EYS Patented July 11,

ES AT 2,514,837? SEWING-MACHINE 1 Mario Buono, New York, N. assignor to U; S.

Blind StitchMachine Corp.,fNew York, .N.

I a corporation of New York V Application June21, 1949, s rial No. 100,363

This, invention relates to improvements ina chain stitch,blind-stitch, skip-stitch,sewing machine, of the type illustrated in U. S. Patents No. 1,926,644 and vNo. 1,926,761, dated September 12, 1933;1and,No. 2,108,100, issued-on February 13, 1 3 ,H, h

A ma chine of ,this type has a curved needle, whoseholder is pivoted to,the frame of the machine and which is oscillated laterallyaround a longitudinal and horizontal axis;.a work-support orworketable-whichis pivoted to the frame of the machine and which is rocked or oscillated about a horizontal lateralaxis, so that the longitudinal arm of said work-support is moved up-and-down relative-towthe lateral path of the needle; and a rib or bight-forming: member which is pivotedtosaidworksupport on a lateral axis; said rib being rocked, or oscillated relative to said work-support Claims. (01. 112 -176) Fig. 1 the arm 54 which is later described, is shown in its full-line position of Fig.;8, in which the machineyoperates to form skip-stitches; i

Fig. 2is asections; on the lineZ- Z of;.-Eig. ,7,

showing certainoi the ,partsillustrated in Fig. 1. In Fig. 2, the arm 541s; shown in its broken-line position of Fig. 8, in which the machine operates to form consecutive or non skip stitches;

Fig, 3 is a vertical section taken at the stitching station of Fig.3, illustrating the formation of a non-skip stitch, inwhich the needle passes through both layers ofcloth which are to be sewed to eachother; 1.

r Fig. 4 is aviewsimilar to Fig. a frustratin inqorder to 'form, a ;:bight in the layers or plies ofcloth. 1 When said layers of cloth are ofsufiicient thicknessthe needle penetrates the top layer, of cloth inwsaid bight betweens its top and bottom faces, thus forming aiblind-stitch which is invisible at thefair or. exposed face of the garment or} otherrsewed article.;i When the layers of fabric are-thin, the needle will penetrate the top layerthrough-and-through; but such stitch is designated as a blind stitch inthe trade. Said prior patents disclose mechanism formaking skip-stitches, wherebythe stitches skip the layer next to the top layer of the bight in predetermined-succession, thustacking the top layer of thexbight to the next. layer only at, every second or third stitch, or in any other desiredirelation.

.For certain purposes; it-:is highly desirable to control such machine during its operation, so that it will tack the top layer to the next layeror layers, either by skip-stitches, or by aplurality 011 consecutive tacking stitches of any desired number which connect said top layer to the next layer or layers. 1 For this purpose, I provide mechanism whereby .the rocking movement of the work-tablecan be controlled while the machine is running or stationary.

Since many of the parts of said machine are well-known and disclosed, in said prior patents, the" disclosure herein does not include many, of said well-knownparts; l

Other objects j and advantages and featuresv of: my;.invention,;-are set forth in the annexedde scription' andbdrawings which illustrate a preferredembodiment thereof, I; 1 i

is a. transverse section along the 9.. ,1;- QfiFi .w7,. ,Partiallyi elevation, which 1 shows certain essential parts of the machine. In

atop-longitudinal arm, alongwhich the work is,

the formation of a skip stitch, in I which the needle passes only through the top cloth layer;

Fig. -5,is a perspective view, showing-a piece of fabric which has been folded in order to provide aflap whichoverlies thebody of saidpiece offabric; and it illustrates the formation of skip stitches in sewing said flap to said body;

.-;Fig. 6' is a section along the line 6-6 of Fig. 5;

Fig is a section on the line ofFig. 1; Fig; 8 is a section on the line B8 of Fig.1; Fig. 9 is a section on the line 9-;9 of Fig. 1;-

Fig, 10 isya section on the kn w-4o f Fig. 7;

Fig. 11 is a 7; and; I a

Fig. 12;is an explodedperspective view illustrating certain parts of the machine,

The machine has a frame l, to whichthe worksupport or work-table .36 is pivotally connected bya lateral pivot 31. Said work-support 36 has section onthe line llll of Fig.

fed longitudinally, in the directionof the arrow shown in Fig. 1.

The usual rib R isturnably connected to work support 36 bya lateral pivot 66, 1 The machine has the usual curved needle N and looper L.

,-As viewed in Fig. 1, the work-support 36 is biased to turn counter-clockwise around its lateral pivot 3-1 relative to frame; I, by means of a longitudinal tension spring 40. As shown in Fig. l, the rear end of tension spring 40 is. connected to a longitudinal adjusting screw 41, which extends througha tapped bore of frame I. This; screw is longitudinally adjusted to regulate the tension of spring lll. 1 Screw M is releasably fixed in its adjusted position by a lock nut 42. The front end'of tension springlli) is connected to a longitudinal rod, 43, whichiisshown in broken lines in Fig. 1; .The dependingarmof work-support 36 has a longitudinal tapped bore, through which an adjustable screw- 44 extends. 1 After being longitudinally adjusted, said screw 44 is fixed in its n-0m l Ski amass with tiv'stt z, Q ttt-evrfti=is=" steamed u; said full-line itionIfDuring'said downward turning movement oflever 3|," theshift'rod 52 is 3 m v outwardly or to'jthe left as viewe in Fig. 8

against thefforce of spring 53 and thefiange 51a 'f arm' .5' l moved from its 'broken line position of Fig." S'tditsffull-lihe position of'Fig. 8, thus turning" rm, counterclockwise afs' viewed'in Fig. and; thus simultaneously turning arm 54 ,clok'wise 'as'viwedihFig. Bjto t he full-line or 'tit'chjjfposition of arm f 54 .frorn' its brokenline or nons'kip-sti'tch position. I-Ience, when lever 61 z. is in its jfvertical, broken-line position of 'Figyiifarm' 51 is also in its broken-line position of Fig. 8, arm 54 is also in its broken-line position of Fig. '8, and the machine is set to form the rion-skipstitches H which are shown in Figs. 3 and 6. When lever BI is in its full-line position of Fig. 8, arms 51'and5 iare in theirrespective full-line positions of Fig. 8, and the machine is setto ,form the skip-stitches '10, which are shown inFigs. 5and. 6. When the lever 54 is in its broken-line or nonskip stitch position of Fig. 8, the stroke of reciprocating rod 25 is insuflicient to rock the worksupport 36, and the rib R can form a bight as shown in Fig. 3, in which the curved needle N,

which oscillates in the lateral path T, pierces the layers of fabric to form a tacking or non-skipstitch ll through both layers of fabric 69 and 68.

If the bottom layer 68 is sufficienly thick, this willform a blind stitch H in such bottom layer of fabric 68. If bottom layer 68 is sufliciently thin,

said tacking stitch H will be Visible at the bottom face of layer 68.

When arm 54 is in its full-line position of Fig. 8, each forward longitudinal stroke of reciprocating rod 25 will cause said rod 25 to strike the bottom end 54a of arm 54, thus temporarily depressing the top of work-support 36, so that the bight is formed as shown in Fig. 4, thus forming a non-tacking or skip-stitch 10, which may be a blind stitch in top layer 69, if said top layer 69 is sufiiciently thick. If layer 69is sufficiently thin, the stitch 13 will not be a blind stitch.

As shown in Fig, 2 and previously noted, the fulcrum of the oscillating lever 19 is the pivot 20 of a lever 2i. Said lever 2| is tumably connected by a pivot 33 to the frame I of the machine, and

said lever 21 has a rigid and integral finger 2la. As shown in Fig. 2, said lever 2| is turnably connected by a pivot 22 to a longitudinally slidable rod 23, which is guided in a bore of the frame I. Said rod 23 has a transverse pin 29. As best shown in Fig. 1, a compression spring 28 has one end thereof abutting frame I, and its other end abutting pin 29, so that rod 23 is biased rearwardly, and lever 2| is biased to turn counterclockwise, as viewed in Fig. 1. This rod 23, which is-a stop rod, is alined with a stop-screw 38, which extends longitudinally and adjustably through a tapped bore of work-support 36. The screw 38 is held in its adjusted position by a lock nut 39. As above noted, tension spring 40 biases worksupport 36 to turn counter-clockwise, as viewed in Fig. 1. By longitudinally adjusting stop-rod 23, the normal height of the top arm or plate of work-support 33 can be adjusted.

As shown in Fig. 1, the rigid finger 2 la of lever 2| is located between the arms 32 of a fork-shaped member. These arms 32 have tapped bores, through which an adjusting screw 33 extends. Said screw 33 has a smooth shank-part which fits turnably in a bore of frame I. Said screw 33 is fixed to an external knob 34, which turnably abutsframe I, and which has a knob '35; The lever2i can thus be manually turned in, order to regulate thedepth of the stitch, informing 'either type ofjstitch shownin Figs; 3 and 4. 1

k The adjustment of 1ever2l will alter the length of.the'reciprocatingstroke of rod 25. This change of the length ofthe stroke of rod 25 may be slight and'ne'gligible', or substantial. I

The machine is provided with the .usual slotted needle plate '61, which is fixed to framel, and throughwhose slot the bight of the'work. extends whena stitch is formed." H I "j The machine lso has "the usual mechanism for oscillating rib R relative to work-support"36, in unison with the needle. 7

. Thefabric is fedlongitudinally and rearwardly over the top arm or plate of work-support 36, in thedirection of the arrow shown in Fig. 1.

While apreferred embodiment of the invention has been disclosed, numerous changes and omissions andv additions can be made without depart-,- ingfrom' its scope.. I i

1. In a chain-stitch sewing machine of the type which has a frame and a work-support pivotally connected to said frame by a lateral pivot and a rib which is pivotally connected to said work-support by another lateral pivot and a needle which is mounted to oscillate above said work-support and rib in a lateral path and in which said work-support has a top work-supporting arm and front depending arm and in which a spring is connected to bias said work support to normal position against a stop to provide tacking stitches between superposed layers of cloth when said work-support is in said normal position and to provide skip-stitches when said work-support is rocked relative to said frame against the force of said spring to lower said top work-supporting arm, the combination of a longitudinal actuating rod located rearwardly of said front depending arm and guided for longitudinal reciprocating movement in said frame, operating means for longitudinally reciprocating said longitudinal ac-.

tuating rod in a stroke of selected length, an abut ment arm pivotally connected to said depending arm at the inner face of said depending arm and located below the first-mentioned pivot, said abutment arm being movable to an operating position' in which it is alined with said actuating rod below said first-mentioned pivot, said abutment arm being movable to a non-operating position in which it is out of the path of movement of said actuating rod, said abutment arm being suificiently thick to be struck by said actuating rod 1 during its forward movement when said abutment arm is in said operating position to thus rock said Work-support, said stroke being sufficiently short so that said actuating rod remains out of contact with said depending arm when abutment arm is not in operating position.

2. A combination according to claim 1, in which said depending arm is laterally disposed, and said abutment arm is turnable in a lateral plane relaamass? 7 said rod extending exteriorly of said work-support.

'4. A combination according to claim 1, in which said depending arm is laterally disposed, and said abutment arm is turnable in a lateral plane relative to "said depending arm, said abutment arm having'a recess, a second arm pivoted to said dc.- pending arm at its inner face and having a ing; which is located in said recess, a laterally slidable rod mounted slidably in said work-support, said 'rod being pivotally connected tosaid second arm, said rod extending exteriorly of said work-support, .a compression spring mounted on said rod and biasing said abutment arm to non-operating position, a hand-operated lever external to said work-support, said hand-operated lever being pivotally connected to said .rod externally of .said work-support, a roll connected .to said lever nd contacting movably with the external face of said work-support, said'lever having an upstanding position which corresponds to .said non-operating'position, said le'ver being operative to move said rod outwardly relative to said work-Support to shif a d a u m nt arm to ts o at n po h tion when said lever is turned down.

'5. A machine according to claim 1, in which said operating means include a link which is piv ted to an ad us bl lever to provide a l crtim .ior said link and means ior' vertically 0s.- c'illating said link, .sa'id link being pivotally .connected to said actuating rod, a longitudinal stop rod pivotally connected .to said adjustable lever, said top r d being longi u a l mo able a d being adapted to stop the rocking movement of said work-sup t u der t e for o said n and me n :for ad u t n ai e 'e MA IO B Q- N me e N mbe v Strob'el May 2, 19 39 

